新型点式接触动力加压接骨板固定对羊完整胫骨皮质骨血流量的影响

Effects of point contact-dynamic compression plate on cortical bone blood flow in adult goats

目的 观察新型点式接触动力加压接骨板 (PC -DCP)和动力加压钢板 (DCP)固定段皮质骨血流动力学的变化。 方法 成年山羊 15只 ,在其完整胫骨中段分别采用PC -DCP和DCP固定。术后 1d、2 ,6 ,12周用放射性微球法测定局部皮质骨血流量。 结果 DCP板下皮质骨在术后 1d血流量急剧降低 ,到 6周时仍低于正常对照 ,直到术后 12周血流量才完全恢复 ;PC -DCP板下皮质骨血流量术后 2周时已恢复并超过正常对照 ,到 12周一直维持在较高水平。 结论 PC -DCP可明显保护板下皮质骨血运。

Objective To compare the effects of point contact-dynamic compression plates (PC-DCP) and dynamic compression plates (DCP) on cortical bone blood flow in an intact sheep tibia model. Methods Fifteen mature goats were used in this experiment. After the bilateral tibia of goats were fixed with DCP and PC-DCP respectively, the regional cortical bone blood flow was measured at four time intervals (1 day, 2, 6 and 12 weeks after operation) using radiolabelled microsphere technique. Results After operation, the cortical bone blood flow was acutely decreased at the first day, kept lower than normal level until six weeks and recovered at the 12th week. The blood supply under PC-DCP recovered to normal, even over normal level two weeks after operation and remained at a high level until 12 weeks. Conclusions PC-DCP can markedly protect cortical bone blood flow.